Structural, vibrational and microwave properties of xLa(Mg1/2Ti1/2)O3-(1-x)Ba(Mg1/3Nb2/3)O3

Vibrational and microwave dielectric properties of xLa(Mg1/2Ti1/2)O-3-(1-x)Ba(Mg1/3Nb2/3)O-3 (x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0) synthesized by the solid-state reaction technique are investigated. The Rietveld refinement of the X-ray diffraction (XRD) data confirms that Ba(Mg1/3Nb2/3)O-3 (x = 0.0) adopts the 1:2-ordered structure with trigonal P-3m1 space group, whereas La(Mg1/2Ti1/2)O-3 (x = 1) has monoclinic P2(1)/n crystal structure. Both the materials have single phase crystal structure. For x = 0.1, the sample is found to have double phase. Further, with the increase in the value of x, the crystal structure becomes monoclinic P2(1)/n. The vibrational properties of the materials are studied by the Raman spectroscopy and are correlated with the structural parameters. All the materials show high dielectric constant (epsilon (r) > 35) at microwave range. The factors affecting the microwave dielectric properties are discussed based on the vibrational and structural data.

Automated summary

The vibrational and microwave dielectric properties of xLa(Mg1/2Ti1/2)O-3-(1-x)Ba(Mg1/3Nb2/3)O-3 materials synthesized by solid-state reaction were investigated. The materials exhibited high dielectric constant at microwave range and their crystal structures varied with the composition. The factors affecting the microwave dielectric properties were discussed based on vibrational and structural data.